makemkvcon, Linux: How to remux a DVD or BD backup folder?

[BD-BD-BD]

I haven't found a way to remux a loose folder with the CLI build; the instructions has a related example:

Copy all titles from first disc and save as MKV files:

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makemkvcon mkv disc:0 all c:\folder

I'm not copying from a disk, but a local disk backup directory. I've tried running:

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makemkvcon --robot mkv /path/to/the/DVD/backup all /the/output/path

..and some variations, the process fails. I'm I only missing a prefix before '/path/to/the/DVD/backup' or is this functionality unavailable in the CLI app?

I've installed MakeMKV from Flathub — the actual command to launch the CLI version is:

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flatpak run --command=makemkvcon com.makemkv.MakeMKV

EDIT: The OP has been edited for clarity, refer to the next comment for functional makemkvcon commands.

EDIT-2: Cleaned the post title.

[BD-BD-BD]

I was missing the `file:` prefix: example commands for both DVD and BD:

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makemkvcon mkv --robot file:/mnt/media/DVD-folder/VIDEO_TS.IFO all /the/output/path

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makemkvcon mkv --robot file:/mnt/media/BD-folder/BDMV/index.bdmv all /the/output/path

Extracts all titles from a DVD or BD directory. See the manual for other input options:

Source specification:
iso:<FileName> - open iso image <FileName>
file:<FolderName> - open files in folder <FolderName>
disc:<DiscId> - open disc with id <DiscId> (see list Command)
dev:<DeviceName> - open disc with OS device name <DeviceName>

[BD-BD-BD]

The syntax appears to have changed somewhat recently — now makemkvcon doesn't detect nor require the 'file:' parameter. A sample command (Linux) to rip a BD folder:

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makemkvcon mkv --robot ~/Videos/discs/BD/BDMV/index.bdmv all ~/Videos/discs/remux/ | less

I tested with a DVD and BD, both decrypted to a folder (possibly using another program).

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MakeMKV 1.17.6 (Flatpak)